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Earnings Per Share
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
Basic earnings per share has been computed based upon the weighted average number of common shares outstanding. Diluted earnings per share has been computed based upon the weighted average number of common shares outstanding plus the effect of all potentially dilutive common stock equivalents, except when the effect would be anti-dilutive.

The following table sets forth the computation of basic and diluted earnings per share (in millions, except per share data).

Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Basic and diluted earnings per share:
Numerator:
Net income, basic and diluted$113 $101 $256 $232 
Denominator: 
Basic weighted average common shares28.3 29.7 28.5 29.8 
Stock options, RSUs and PSUs0.2 0.5 0.3 0.5 
Weighted average shares used to calculate diluted earnings per share28.5 30.2 28.8 30.3 
Earnings per share:
Basic$3.99 $3.41 $8.98 $7.79 
Diluted$3.96 $3.36 $8.89 $7.66 
Antidilutive stock options, RSUs and PSUs— 0.1 0.1 0.1